| Name: | Chandrika Gopal |
| Affiliation: | Bengaluru University |
| Conference ID : | ASI2024_380 |
| Title : | Variations of Mg II Daily Index and Sunspot Area |
| Authors : | Chandrika G1, Ravindra B2 and VijayaKumar H Doddamani3
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| Authors Affiliation: | 1 Department of Physics, Bangalore University, Bengaluru-56 India
2 Indian Institute of Astrophysics, Koramangala, Bengaluru-34 India
3 Department of Physics, Bangalore University, Bengaluru-56India
*Corresponding author E-mail: chandrikafsl@gmail.com
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| Mode of Presentation: | Poster |
| Abstract Category : | Sun, Solar System, Exoplanets, and Astrobiology |
| Abstract : | Sunspots are Photosphere feature and these are the dark irregular spots observed on both sides of the hemisphere. Magnetic field associated with Sunspots can influence the emission of Solar UV radiation which in turn influence the Earth's climate and upper atmosphere. The UV radiation emission from the Sun varies with the sunspot cycle with approximately 11-year periodicity. Over the 11-year period, variations in UV, EUV, and X-rays are significant compared to the visible part of the electromagnetic spectrum. Mg II lines emission are used to study the characteristics of the Chromosphere and their flux varies with the solar cycle. The h (279.6 nm) & k (280.3 nm) lines of the Mg II spectra emitted from the Chromosphere represent the solar UV variability. This poster presents the results of comparing the Mg II core-to-wing ratio of the h & k lines (UV radiation) with the sunspot area over a period of 25 years.
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